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Bench Test · 9 min read
We ran the j7+ daily for twelve months in a two-dog household. Here's what the battery, the bin and the obstacle avoidance actually did.
By Robot AutoTrader Bench Team · 19 June 2026 · Unit bought at retail
A year in, the j7+ remains the best camera-navigation vacuum for pet homes — and a strong used buy at £350–£420 with battery health above 85%.
Placeholder artwork — test photography appears here in production.
Twelve months, 341 completed runs, one dog-related incident it handled better than we did. The Roomba j7+ remains the camera-navigation vacuum to beat in a pet household, and its second-hand economics are now genuinely compelling: used examples with healthy batteries sell for £350–£420 against a £799 launch price, and nothing about our year suggests the hardware won't do five.
It is not the strongest raw suction in its class — the numbers below put it mid-pack on carpet — but it is the most reliable decision-maker we've tested. It saw every cable, every shoe and, critically, everything the dog left behind. iRobot's pet-waste guarantee remains real: we tested it. Twice.
Our standard domestic protocol: a 94 m² two-floor home, two dogs (a moulting Labrador and a terrier with opinions), daily scheduled runs for twelve months. Debris scores use our weighed-pickup method — a measured 20 g mix of rice, oats and dog hair per zone, bin contents weighed after each pass.
| Hard-floor pickup (weighed) | 96% new | 94% at 12 months |
|---|---|---|
| Carpet pickup (weighed) | 81% new | 78% at 12 months |
| Pet-hair pickup on carpet | 94% new | 94% at 12 months |
| Battery runtime (measured) | 104 min new | 98 min at 12 months |
| Obstacle avoidance (30-object course) | 28/30 new | 29/30 at 12 months |
| Failed / abandoned runs | — | 4 of 341 (98.8% completion) |
The headline number used buyers should care about: after 341 charge cycles our battery health sits at 91%, an almost linear ~0.75% decline per month of daily use. Runtime fell from 104 to 98 minutes — imperceptible in a self-emptying robot that returns to base mid-job anyway. Extrapolating the curve, a three-year-old daily-use j7+ should still hold ~75%: fine for flats, marginal for large homes. That is exactly why every Robot AutoTrader listing carries a measured battery figure, not 'battery good'.
Clean Base bags: we used 14 in a two-dog year at ~£3.50 each. Filters and side brushes added £31. Budget roughly £80 a year in consumables for a pet home — third-party bags work but shed more dust on the weekly bin swap. The camera lens wants a monthly wipe; skip it and obstacle detection degrades noticeably by week six.
How we fund this: Bench Test units are bought at retail. If you buy a new robot through outbound retailer links we may earn an affiliate commission; it never affects scores, and used listings on Robot AutoTrader carry no commission in this phase.